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Fix blank page on Windows due to broken .js MIME type (#4674)

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* Fix blank page on Windows due to broken .js MIME type in registry

* Update studio/backend/main.py

adding defensive suggestion by gemini where we make the mimetypes specific to windows platforms

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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Roland Tannous 2026-03-28 22:26:49 +04:00 • committed by GitHub
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studio/backend/main.py
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@ -23,10 +23,23 @@ if _backend_dir not in sys.path:
# See: https://github.com/python/cpython/issues/102396
import _platform_compat # noqa: F401
import mimetypes
import shutil
import warnings
from contextlib import asynccontextmanager
# Fix broken Windows registry MIME types. Some Windows installs map .js to
# "text/plain" in the registry (HKCR\.js\Content Type). Python's mimetypes
# module reads from the registry, and FastAPI/Starlette's StaticFiles uses
# mimetypes.guess_type() to set Content-Type headers. Browsers enforce strict
# MIME checking for ES module scripts (<script type="module">) and will refuse
# to execute .js files served as text/plain — resulting in a blank page.
# Calling add_type() *before* StaticFiles is instantiated ensures the correct
# types are used regardless of the OS registry.
if sys.platform == "win32":
mimetypes.add_type("application/javascript", ".js")
mimetypes.add_type("text/css", ".css")
# Suppress annoying dependency warnings in production
if os.getenv("ENVIRONMENT_TYPE", "production") == "production":
warnings.filterwarnings("ignore")